ECN Infra Demo

ECN Internal Infrastructure Demo

In order to collect available digital vector assets of building footprints statewide (data), QA/QC that data, and build derived products from that data, project internal infrastructure is required. A demonstration of integrated components follows:

WMS Identify — LA Bldgs

WMS Layer assets are made available via Web Mapping Services. WMS layers carry styling rules, and are intelligently sampled on the server-side to send only necessary information across slower data links. Selected WMS layers also support feature identification. -wikipedia-

Orthophotos Aerial imagery with the camera oriented straight-down is sometimes called the Bombardier’s View and is a typical method to create orthophotos. Tracing vector assets over orthophotos is common. Every one of the major imagery providers does have alignment issues in various local geographical areas. In the JOSM Openstreetmap editing environment, there are provisions for storing offsets, per local area, per imagery provider (e.g. MapBox Satellite versus BING in Central Europe). However, given current mapping feature density, it is possible for an OSM editor to simply copy the offsets of other features around them, somewhat analogous to driving a car in traffic at the same speed as the other cars, irregardless of the posted speed limit. Imagery alignment does matter and poor alignment can be the source of errors, but modern image analysis benefits from a crowd effect of multiple, stable reference sets in most all areas. These benefits are most quickly exploited by a human operator; using reference data to stabilize offsets in a machine learning environment is TBD.